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74LVC244ABQ Datasheet(PDF) 8 Page - NXP Semiconductors |
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74LVC244ABQ Datasheet(HTML) 8 Page - NXP Semiconductors |
8 / 18 page 74LVC_LVCH244A_6 © NXP B.V. 2009. All rights reserved. Product data sheet Rev. 06 — 13 August 2009 8 of 18 NXP Semiconductors 74LVC244A; 74LVCH244A Octal buffer/line driver; 3-state [1] tpd is the same as tPLH and tPHL. ten is the same as tPZL and tPZH. tdis is the same as tPLZ and tPHZ. [2] Typical values are measured at Tamb =25 °C. [3] Typical values are measured at Tamb =25 °C and VCC = 3.3 V. [4] Skew between any two outputs of the same package switching in the same direction. This parameter is guaranteed by design. [5] CPD is used to determine the dynamic power dissipation (PD in µW). PD =CPD × VCC2 × fi × N+ Σ(CL × VCC2 × fo) where: fi = input frequency in MHz; fo = output frequency in MHz CL = output load capacitance in pF VCC = supply voltage in Volts N = number of inputs switching Σ(C L × VCC 2 × f o) = sum of the outputs. 11. AC waveforms CPD power dissipation capacitance per buffer; VI = GND to VCC;VCC = 3.3 V [5] -10- - - pF Table 7. Dynamic characteristics …continued Voltages are referenced to GND (ground = 0 V). For test circuit see Figure 8. Symbol Parameter Conditions −40 °C to +85 °C −40 °C to +125 °C Unit Min Typ[2] Max Min Max Measurement points are given in Table 8. Logic levels: VOL and VOH are typical output voltage levels that occur with the output load. Fig 6. The input (nAn) to output (nYn) propagation delays mna171 nAn input nYn output tPLH tPHL GND VI VM VM VM VM VOH VOL |
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